well, the Placement.info is exactly as shown in my first msg, i.e.' ' Fields_MediaPicker-Image="Content:7" '

otherwise it's exactly as agriffard explains.

I was more struggling with the 'alternate' naming convention(s) and how to setup the 'queries' in a way that it only shows on the 'details' screen.

To prevent showing '~/Media/Default/ClubIdent/xyz.jpg' on the details screen you need to check 'Exclude from Display' in the 'queries'.

To show the Image also on the 'details' screen:
Rewrite results: <img src="{Content.Fields.Parcours.Image.Url.Absolute}" width="130" height="100" />
uncheck 'exclude from display'
Placement.info: something like Fields_MediaPicker-Image="Content:7 in the 'details' section